Piston-rod packing.



N0. 644,696. Patented Mar. 6, 1900. F. F. sw

PISTON BOD P NG.

(Application filed May 20, 1899.)

(No Model.)

FREDERICK F. SWAIN, OF CHICAGO, ILLINOIS.

PiSTON-ROD PACKI NG.

SPECIFICATION forming part of Letters Patent No. 644,696, dated March 6, 1906.

Application filed May 20, 1899. Serial No. 717,546. (No model.)

To a whom it may concern:

Be it known that I, FREDERICK F. SWAIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Piston- Rod Packing, of which the followingis a specification.

This invention relates to metallic packing for piston-rods.

The object of the invention is to provide a metallic packing for piston-rods which is simple in construction, inexpensive in manufacture, and thoroughly efficient in operation.

The invention consists, substantially,in the construction, combination, location, and arrangement of parts, all as will be more fully hereinafter set forth, shown in the accompanying drawings, and finally more particularly pointed out in the appended claims.

Referring to the accompanying drawings and to the various views and reference-signs appearing thereon, Figure l is a broken view in section, taken longitudinally of the pistonrod, showing a stuffing-box with a packing embodying the principles of my invention applied thereto. Fig. 2 is a face View of a form of sectional packing-ring embodying my invention. Fig. 3 is a similar view showing a slightly-different arrangement for clamping the ring-segments. Fig. 4 is a view similar to Figs. 2 and 3, the piston-rod being shown in transverse section, and illustrating a modified construction embodying the principles of my invention and included in the scope thereof. Fig. 5 is a similar view showing another modified form of my invention. Fig. 6 is a detached detail view of the clamping-spring before it is placed in clamping position.

In the drawings reference-sign A designates the piston-rod, upon which the metallic packing embodying my invention is adapted to be assembled. This packing is constructed in the form of bands or rings arranged to encircle the piston-rod A and to be clamped thereto in a manner permitting of slight lateral movement of the piston-rod when necessary, while constantly maintaining a steamt-ight joint. In the form shown in Fig. 2 the packing comprises a ring composed of sections 6. These ring-sections are held in place and in concentric relation with respect to the longitudinal axis of the piston-rod by the superposed ring-sections 7, arranged to break joints with respect to the inner ring-sections. Overlying the outer ring sections are the plates 8, having outwardly-turned or hook ends 9, and the several ring-sections when arranged and assembled in proper concentric relation are held and securely clamped in such relation by means of the sections of springs 10, having hooked ends 11, arranged to engage over the hooked ends 9 of the clamping-plates S. The clamping springs are formed in the shape of segments of a circle of shorter radius than the circle of the packing-rings and are sprung out in order to enable the ends thereof to be engaged over the ends of the clamping-plates. By this construction it will be seen that the packingrings are efficiently clamped to the piston-rod, with lap-joints between the sections of the inner ring and those of the outer ring, while permitting a desirable degree of resilience. It will also be seen that the rings are constantly held and maintained in true concentric relation with respect to each other, as well as with respect to the piston-rod.

If desired, the clamping-plates 8 may be omitted, and the hooked ends 11 of springs 10 may be sprung over lugs or shoulders 12, formed on the ends of the outer packing-ring segments, as clearly shown in Fig. 3.

I have shown the principles of my invention applied in another Way in Fig. 5, wherein the packing-rings are in the form of split rings. The inner split ring 13 is adapted to be sprung over the piston-rod, and the outer split ring 14 is then applied over the inner ring, so as to break joints therewith, and the two superposed rings are securely and efficiently clamped in concentric relation with respect to each other and the piston-rod by means of a split clamping-ring 15, of suitable spring material.

In Fig. 4 I have shown another modified arrangement embodying the principles of my invention and which for many purposes I prefer to use. In this construction the inner packing-ring 16, whether made in sections or segments, as shown, and similar to the construction shown in Figs. 2 and 3 or whether made in the form of a split ring, as is obvious, and as shown in Fig. 5, has its outer surface eccentric with reference to the axis of the piston-rod, or, in other words, this ring is made thicker at one point than at another. Similarly the outer packing-ring 17, whether made in segmental sections or as a split ring, is also made eccentric in the same manner, as shown. These eccentric packingrings may be held upon the piston-rod in assembled and eccentric relation with respect to each other by any suitable meanssuch, for instance, as above described with reference to the constructions shown in Fig. 2, 3, and 5. In the form shown the clamping-springs 10, adapted to have their hooked ends sprung over the hooked ends of clamping-plates 8, are employed. By reason of this eccentric construction and arrangement itwill be seen that the joint between the contacting surfaces of the inner and outer rings will belapjointed with respect to that of the next adjacent assemblage of rings where two or more of such constructions are employed, as indicated in Fig. 1, or, in other words, the joint between the members of one set of rings will occupy a diiferent plane with respect to that ofthe members of the adjacent set. This construction also prevents the sections of the eccentric rings from creeping endwise by reason of the wedge action of the eccentric form of the ring-sections. In this figure of the drawings the parts are shown in assembled relation ready for use, and three sets of the packing-rings are employed. It is obvious, however, that only one or any number of sets of the rings may be employed. The rings are mounted on the piston-rod in the manner above described and are held in place by any suitable means. I have shown a simple and efficient arrangement wherein I employ a retaining-gland 18, suitably bolted or otherwise secured to'the end of the casing 19, and against which the outer face of the outer set of packing-rings bears. Arranged between the gland 1S and the casing 19 is a sleeve 20, having an inwardly-projecting flange 21 at its inner end, through which the piston-rod freely passes. A piston-ring 22 of somewhat-larger internal diameter than the external diameter of the piston-rod A is arranged to encircle the piston-rod, and the outer periphery thereof contacts with a ground surface on the interior of sleeve 20, thus forming an efficient steamtight joint at this point. The packing-rings are held between piston-rin g 22 and the gland 18, said ring being retained by the inwardlyprojecting flange 21 of sleeve 20. If desired, and as shown, said flange may be suitably perforated, as indicated at 23, to permit the steam to gain access to the inner face of piston-ring 22, thereby firmly and efficiently pressing said ring against the packing-rings, thus maintaining perfectly steam-tight joints and also preventing access of steam to the packing and allowing, by reason of its greater interior diameter, of lateral vibration of the piston-rod.

By the construction above described I provide an exceedingly simple and efficient packing for pistons, easily applied and economical in manufacture.

Many changes and variations in the details of construction and arrangement would readily suggest themselves to persons skilled in the art and still fall within the spirit and scope of my invention. I do not desire, therefore, to be limited or restricted to the exact details shown and described; but,

Having now set forth the object and nature of my invention and various forms of construction embodying the principles thereof and havingdescribedsuch constructions,their function, and mode of operation, what I claim as new and useful and of my own invention, and desire to secure by Letters Patent, is

1. A packing for piston-rods, comprising an inner ring arranged to encircle the rod, an outer ring arranged to encircle the inner ring, clamping-plates arranged to encircle said outer ring, and clamping-springs arranged to engage said plates to hold the parts in the desired relation, as and for the purpose set forth.

2. A packing for piston-rods, comprising an inner ring arranged to.encir'cle the rod,

an outer ring arranged to encircle the inner ring, clamping-plates having hooked ends and arranged in encircling relation with respect to said outer ring, and clamping-springs having hooked ends adapted to be sprung over the hooked ends of said clamping-plates and operating to hold the parts in the desired relation, as' and for the purpose set forth.

3. A packing for piston-rods, comprising a sectional inner ring arranged to encircle the rod, a sectional outer ring arranged to encircle the inner ring and breaking joints therewith, clamping-plates arranged to hold said parts in proper relation, said clamping-plates having hooked ends, and clamping-springs having engaging ends and adapted to be sprung over the proximate ends of adjacent clamping-plates, as and for the purpose set forth.

4. A packing for piston-rods, comprising an inner eccentric ring and an outer eccentric ring, the eccentricities of said rings being oppositely arranged with respect to each other, and means for clamping the same upon the piston-rod, as and for the purpose set forth.

5. A packing for piston-rods, comprising an inner ring having an eccentric outer surface, and arranged to encircle the piston-rod, an outer eccentric-shaped ring arranged to encircle said inner ring, the eccentricities of said rings being oppositely arranged with respect to each other, and a holding-spring encircling said outer ring for holding said rings in proper relation, as and for the purpose set forth.

6. A packing for piston-rods, comprising a plurality of sets of packing-rings'mounted on the rod, each set including an inner ecccntrio-shaped ring and an outer eccentric shaped ring, the eecentricities of said rings being oppositely arranged with respect to each other, the sets of rings breaking joints with each other, and an encircling holdingspring, as and for the purpose set forth.

7. The combination with a casing, of a gland bolted thereto, a sleeve having an inwardlyprojecting perforated flange, a retaining-ring arranged to bear against said flange and the interior of said sleeve, and one or more sets of packing-rings interposed between said retaining ring and gland, as and for the purpose set forth.

8. A packing for piston-rods, comprising the combination of a casing, a gland, a packing-ring, a sleeve surrounding the packingring and extending inwardly beyond the same, and a piston-ring bearing against the inner side of the packing-ring and on its peripheral surface forming a joint against the sleeve, whereby said piston-ring prevents access of steam-pressure to the outer periphery of the packing-ring, as and for the purpose set forth.

9. In a packing for piston-rods, the combination of a casing, a gland, one or more pack ing-rings, a sleeve surrounding the packingrings and extending inwardly beyond the same, said sleeve provided at its inner end with an inwardly-projecting flange, and having a ground-seat formed on the inner surface thereof, and a piston-ring held between said flange and the packing ring or rings, and bear ing on its outer periphery against said groundseat, said piston-ring and flange having their bores of larger diameter than the exterior diameter of the piston-rod, as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 18th day of May, 1899, in the presence of the subscribing witnesses.

I FREDERICK F. SWAIN.

Witnesses:

FRANK T. BROWN, E. O. SEMPLE. 

